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[ethmac] CRC



Having developed a custom MAC with Dual RX FIFO memories, I have 
taken just the CRC generator section (eth_crc) to use in our design.

I wanted to know whether there was anything special I need to do in 
order to get CRC agreement other than this:

- Feed the CRC from the raw MII nibbles, with the bits transposed in the 
RX_MAC module (0 -> 3, 1-> 2, 2-> 1, 3->0)

- Initialise on the first true data nibble after SFD.

Ed
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